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Общее количество найденных документов : 30
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1.
Инвентарный номер: нет.
   
   S 89


   
    Structural Disordering in Cr-Doped Li4Ti5O12 Spinels / N. A. Zhuravlev, N. A. Mukhina, D. G. Kellerman, V. S. Gorshkov // Bulletin of the Russian Academy of Sciences: Physics. - 2009. - Vol. 73, № 11. - P. 1522-1524 : il. - Bibliogr. : p. 1524 (8 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ШПИНЕЛИ -- ЛИТИЙ -- ЛЕГИРОВАНИЕ -- ХРОМ
Аннотация: The processes of lithium redistribution in the structure of cubic Li4Ti5O12 spinel, caused by both chromium doping and thermal activation, have been investigated by nuclear magnetic resonance. It is shown that Li ions migrate from tetra to octahedral crystallographic positions with an increase in temperature. This process becomes more pronounced at temperatures above 400 K. In contrast, the fraction of tetrahedrally coordinated Li increases as a result of doping with chromium

\\\\Expert2\\nbo\\Bulletin of the Russian Academy of Sciences Physics\\2009, V. 73, N 11, P.1522-1524.pdf
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2.
Инвентарный номер: нет.
   
   G 65


    Gorshkov, V. S.
    Effect of Structural Disordering on the Transport Properties of LiNiO2 / V. S. Gorshkov, E. E. Flyatau, D. G. Kellerman // Inorganic Chemistry. - 2000. - Vol. 36, № 9. - P. 959-963 : il. - Bibliogr. : p. 963 (10 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СТРУКТУРНЫЙ БЕСПОРЯДОК -- СВОЙСТВА ТРАНСПОРТНЫЕ -- ОКСИД ЛИТИЕВО-НИОБИЕВЫЙ
Аннотация: The effect of structural disordering on the transport properties of LiNiO2 was studied over wide ranges of temperatures and oxygen pressures

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3.
Инвентарный номер: нет.
   
   Z 90


    Zuev, M. G.
    Oxidation State of Vanadium in Eu1 – xYxVTa2O9 Solid Solutions / M. G. Zuev, D. G. Kellerman, V. A. Perelyaev // Inorganic Materials. - 2001. - Vol. 37, № 2. - P186-188 : il. - Bibliogr. : p. 188 (9 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКИСЛЕНИЕ -- ВАНАДАТЫ -- МАГНИТНАЯ ВОСПРИИМЧИВОСТЬ -- РАСТВОРЫ ТВЕРДЫЕ
Аннотация: The magnetic susceptibility of Eu1- xYxVTa2O9(0 < x< 0.20) solid solutions was found to vary nonmonotonically with Y content. This result was interpreted as due to changes in the proportion of V4+ ions. Increasing the synthesis temperature from 1100 to 1300°C was shown to raise the proportion of V4+ in EuVTa2O9 from 9.87 to 12.03%. The highest light yield was observed at x~0.05, corresponding to the smallest V4+/V5+ ratio

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4.
Инвентарный номер: нет.
   
   M 17


   
    Magnetic Transformations and Structural Disorder in Lithium Manganite LiMnO / D. G. Kellerman, N. A. Zhuravlev, A. I. Kurbakov, V. G. Zubkov, A. P. Tyutyunnik // Bulletin of the Russian Academy of Sciences: Physics. - 2007. - Vol. 71, № 5. - P. 621-624 : il. - Bibliogr. : p. 624 (8 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МАНГАНИТ ЛИТИЯ -- МАГНИТНЫЕ ПЕРЕХОДЫ -- СТРУКТУРЫ НЕУПОРЯДОЧЕННЫЕ
Аннотация: Investigation of the structural and magnetic characteristics of lithium manganite LiMnO2 with a variable Li/Mn ratio has been performed. A significant difference in the 7Li NMR spectra in the paramagnetic and antiferromagnetic manganite phases is revealed. It is shown that the common feature of the compositions studied is a high degree of structural disorder, which manifests itself in the presence of manganese ions in lithium positions (MnLi) and lithium ions in manganese positions (LiMn); this effect is also characteristic of the stoichiometric composition

\\\\Expert2\\nbo\\Bulletin of the Russian Academy of Sciences Physics\\2007, V. 71, N 5, P. 621-624.pdf
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5.
Инвентарный номер: нет.
   
   E 43


   
    Electronic structure and x-ray spectra of defective oxides LixCoO2 / V. R. Galakhov [et al.] // Physical Review B. - 2006. - Vol. 74, № 4. - P.045120(1-6) : il. - Bibliogr. : p. 045120(5-6) (26 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СТРУКТУРА ЭЛЕКТРОННАЯ -- СПЕКТРЫ РЕНТГЕНОВСКИЕ -- ОКСИДЫ -- LiCoO2
Аннотация: X-ray absorption, resonant x-ray emission, and x-ray photoelectron spectra of the valence band and core levels have been measured for LixCoO2 (0.6<=x<=1.0,. Resonant O K(alfa) x-ray emission spectra of LiCoO2,,showed localized excitonic states due to a dd transition between unoccupied and occupied Co 3d states. On the basis of measurements of Co 3s x-ray photoelectron and Co 2p and O 1s x-ray absorption spectra it was established that in defective cobaltites the electronic holes are localized mainly in O 2p states. Evidence of phase separation in LixCoO2 has been found

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6.
Инвентарный номер: нет.
   
   G 15


    Galakhov, V. R.
    Electronic structure of defective lithium cobaltites LixCoO2 / V. R. Galakhov, M. Neumann, D. G. Kellerman // Applied Physics A. - 2009. - Vol. 94. - P.497-500 : il. - Bibliogr. : p. 500 (18 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КОБАЛЬТИТ ЛИТИЯ -- СТРУКТУРА ЭЛЕКТРОННАЯ -- РЕНТГЕНОВСКИЕ ЭМИССИОННЫЕ СПЕКТРЫ
Аннотация: X-ray absorption, resonant X-ray emission, and??X-ray photoelectron spectroscopical methods have been applied for the study of the electronic structure of defective lithium cobaltites LixCoO2 (0.6 . x . 1.0). Resonant O K alfa X-ray emission spectra of LiCoO2 showed localized excitonic??states due to a dd transition between occupied and??unoccupied Co 3d states. On the base of measurements of Co 3s X-ray photoelectron, Co 2p, and O 1s X-ray absorption spectra, it was established that in defective cobaltites??the electronic holes are localized mainly in O 2p states. An evidence of phase separation in LixCoO2 has been found. It was shown that the semiconductor-to-metal transition in LixCoO2 (x <0.76) at about 160 K is not accompanied by??changes in the Co 3d electronic configuration which remains 3d6

\\\\Expert2\\nbo\\Applied Physics A Materials Science and Processing\\2009, v. 94, N 3, p. 497-500.pdf
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7.
Инвентарный номер: нет.
   
   K 31


    Kellerman, D. G.
    Low-Dimensional Exchange Interactions, Structural Deformation, and Antiferromagnetic Ordering in Lithium Manganite LiMnO2 / D. G. Kellerman, N. A. Zhuravlev // Bulletin of the Russian Academy of Sciences: Physics. - 2008. - Vol. 72, № 8. - P. 1155-1158 : il. - Bibliogr. : p. 1159 (9 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МАНГАНИТ ЛИТИЯ -- СТРУКТУРА КРИСТАЛЛИЧЕСКАЯ -- МАГНИТНЫЕ ПРЕВРАЩЕНИЯ
Аннотация: Structure deformation in lithium manganite LiMnO2 has been analyzed. It is shown that suppression of the Jahn–Teller effect with a decrease in temperature is related to striction effects, which are caused by intercluster exchange interactions. It is concluded that low-dimensional interactions play an important role in the formation of magnetic properties of lithium manganite

\\\\Expert2\\nbo\\Bulletin of the Russian Academy of Sciences Physics\\2008, V. 72, N 8, P.1155-1158.pdf
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8.
Инвентарный номер: нет.
   
   E 43


   
    Electronic Structure, X-ray Spectra, and Magnetic Properties of the LiCoO2 –beta and NaxCoO2 Nonstoichiometric Oxides / V. R. Galakhov, V. V. Karelina, D. G. Kellerman, V. S. Gorshkov, N. A. Ovechkina, M. Neumann // Physics of the Solid State. - 2002. - Vol. 44, № 2. - P266-273 : il. - Bibliogr. : p. 273 (22 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕСТЕХИОМЕТРИЯ -- МАГНИТНАЯ ВОСПРИИМЧИВОСТЬ -- ОКСИД КОБАЛЬТА
Аннотация: This paper reports on a study of the magnetic susceptibility, x-ray photoelectron, and x-ray emission spectra of the LiCoO2 –beta and NaxCoO2 nonstoichiometric oxides. The valence-band structure of LiCoO2 was analyzed. The hole concentration in the oxygen 2p band of LiNiO2 and LiCoO2 was derived from measurements of the O K alfa emission spectra. Measurements of Co 2p and Co 3s photoelectron spectra showed that the Co3+ ions reside in the low-spin state with S = 0. The deficiency of oxygen in the LiCoO2 –delta reduced oxides gives rise to the formation of divalent cobalt ions. The deficiency of the alkali metal in NaxCoO2 initiates the formation of holes in the oxygen 2p band while not changing the electronic configuration d6 of the cobalt-ion ground state

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9.
Инвентарный номер: нет.
   
   E 27


   
    Effect of Electronic State of Ions on the Electrochemical Properties of Layered Cathode Materials LiNi1-2xCoxMnxO2 / N. V. Kosova, E. T. Devyatkina, V. V. Kaichev, D. G. Kellerman // Russian Journal of Electrochemistry. - 2008. - Vol. 44, № 5. - P543-549. - Bibliogr. : p. 548-549 (31 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СЛОИСТЫЕ КАТОДНЫЕ МАТЕРИАЛЫ -- ЛИТИЕВО-ИОННЫЕ БАТАРЕИ -- МАГНИТНАЯ ВОСПРИИМЧИВОСТЬ
Аннотация: The cathode materials of the composition LiNi1– 2xCoxMnxO2(x= 0.1, 0.2. 0.33) synthesized from the Ni, Co, Mn mixed hydroxides and LiOH by using mechanical activation method are studied. It is shown that all synthesized compounds have layered structure described by the space group R-3m. With the decreasing of the nickel content the cell volume and the degree of structure disordering decrease. According to XPS data, the electronic main state of d-ions at the prepared samples' surfaces corresponds to Ni2+,Co3+, and Mn4+. Anincrease in the nickel content leads to the increase of the Ni2p3/2and Co2p3/2binding energy, which points to the change in the Me–O bond covalence. According to magnetic susceptibility measurements data, the nickel ions in LiNi0.6Co0.2Mn2O 2 exist in the two oxidation states: Ni2+and Ni3+. It is shown that this sample has the highest specific discharge capacity (~170 mAh/g). The positions of redox peaks in the differential capacitance curves depend on the sample composition: with the increasing of nickel content they are shifted toward lower voltages

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10.
Инвентарный номер: нет.
   
   E 43


   
    Electronic structure of LiMnO2: X-ray emission and photoelectron spectra and band structure calculations / V. R. Galakhov, M. A. Korotin, N. A. Ovechkina, E. Z. Kurmaev, V. S. Gorshkov, D. G. Kellerman, S. Bartkowski, M. Neumann // European Physical Journal B: Condensed Matter Physics. - 2000. - Vol. 14. - P281-286 : il. - Bibliogr. : p. 286 (27 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МАНГАНИТ ЛИТИЯ -- РЕНТГЕНОВСКАЯ ФОТОЭЛЕКТРОННАЯ СПЕКТРОСКОПИЯ -- ФЛУОРЕСЦЕНЦИЯ
Аннотация: The electronic structure of LiMnO2 and Li2MnO3 was studied by means of X-ray photoelectron and soft X-ray emission spectroscopy. For LiMnO2, LSDA and LSDA+U calculations were carried out. The LSDA+U calculations are in rather good agreement with the measured valence-band structure as well as with the magnetic and electrical properties of LiMnO2. It is shown that the band gap in LiMnO2 is determined by the charge-transfer effect

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